yeah the firmware will probably start of as 1.0 but will more than likely be as mature as the DX50 firmware. Firmware changes were more UI/OS improvements not dac implementation in the DX50. Such as media scanning, scrolling, tags and what not. There was nothing wrong with the dac implementation with the DX50.
Except for one version when they most likely experimented with the slow and quick roll-off dac feature.
I can also see changes if they are going to implement hardware based DSD features. How about volume control not quite like the Wolfson 8740. I am pretty sure they'll operate some DAC controls from the firmware.